/Engine/Plugins/Runtime/Analytics/AnalyticsBlueprintLibrary/Source/AnalyticsBlueprintLibrary/Classes/AnalyticsBlueprintLibrary.h
Gets the current session id from the analytics provider
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Analytics") static [FString](API\Runtime\Core\Containers\FString) GetSessionId()